package com.hmdp.service.impl;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.Shop;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisConstants;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

import java.util.List;
import java.util.stream.Collectors;

import static com.hmdp.utils.RedisConstants.CACHE_SHOP_KEY;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Override
    public Result queryByList() {

        String key ="cache:list:";
        //从redis中查询对应的list是否存在
        List<String> list = stringRedisTemplate.opsForList().range(key, 0, -1);
        //如果list是空的值，那么就从数据库中查询并加入redis中；
        if (list.isEmpty()) {
            List<ShopType> sort = query().orderByAsc("sort").list();
            for(ShopType shopType:sort) {
                String json = JSONUtil.toJsonStr(shopType);
                stringRedisTemplate.opsForList().rightPush(key, json);
                list.add(json);
            }
            return Result.ok(sort);
        }
        //如果存在，直接返回
        List<ShopType> result = list.stream().map(json->JSONUtil
                .toBean(json, ShopType.class))
                .collect(Collectors.toList());
        return Result.ok(result);
    }
}
